[inspector] Refactor protocol-test.js

test/inspector/debugger/async-set-timeout.js

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-InspectorTest.log('Checks that async stack contains setTimeout');
+let {session, contextGroup, Protocol} = InspectorTest.start('Checks that async stack contains setTimeout');
 
-InspectorTest.addScript(`
+contextGroup.addScript(`
 var resolveCallback;
 function foo1() {
   function inner1() {
     debugger;
     resolveCallback();
   }
   inner1();
 }
 function foo2() {
   function inner2() {
     setTimeout(foo1, 0);
   }
   inner2();
 }
 function foo3() {
   var promise = new Promise(resolve => resolveCallback = resolve);
   function inner3() {
     setTimeout(foo2, 0);
   }
   inner3();
   return promise;
 }
 //# sourceURL=test.js`, 7, 26);
 
-InspectorTest.setupScriptMap();
+session.setupScriptMap();
 Protocol.Debugger.onPaused(message => {
-  InspectorTest.logCallFrames(message.params.callFrames);
+  session.logCallFrames(message.params.callFrames);
   var asyncStackTrace = message.params.asyncStackTrace;
   while (asyncStackTrace) {
     InspectorTest.log(`-- ${asyncStackTrace.description} --`);
-    InspectorTest.logCallFrames(asyncStackTrace.callFrames);
+    session.logCallFrames(asyncStackTrace.callFrames);
     asyncStackTrace = asyncStackTrace.parent;
   }
   InspectorTest.log('');
   Protocol.Debugger.resume();
 });
 
 Protocol.Debugger.enable();
 Protocol.Debugger.setAsyncCallStackDepth({ maxDepth: 128 });
 Protocol.Runtime.evaluate({ expression: "foo3()//# sourceURL=expr.js", awaitPromise: true })
   .then(InspectorTest.completeTest);